How much does a 0.20 to 0.49ct D SI2 lab grown marquise diamond cost?

As of October 2026, 0.20 to 0.49ct D SI2 lab grown marquise diamonds typically cost $183 CAD to $831 CAD, with a median price of $313 CAD. There are currently 5 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI2 marquise diamond?

About 22% of these diamonds are available at multiple retailers, with an average price spread of 83%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct D SI2 Lab Grown Marquise

Quick answer

As of October 2026, there are 5 lab grown marquise diamonds with D color and SI2 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $183 CAD to $831 CAD, with a median of $313 CAD. At least 26 retailers stock this exact specification, and 22% of the stones appear at more than one of them, with an average price spread of 83%. Half of all listings fall between $529 CAD and $1,285 CAD per carat. The same specification in natural form lists at a median of about $1,946 CAD per carat. Over the last 30 days the median price moved -6.5% and the number of listings moved +27.9%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Marquise lab grown stones in the index: 485 USD per carat, -3.2% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

$141 CAD

Highest Price

$1,157 CAD

Average Price

$405 CAD

Market Intelligence

Retailers Selling

Cross Retailer %

21.9%

Price Spread

82.7%

30-Day Price Trend

-6.5%

30-Day Supply Change

+27.9%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$653/ct

10th Percentile

$329

Median

$653

90th Percentile

$1,481

Score Distribution

14 diamonds scored across 4 quality tiers

Excellent

2 (14.3%)

Very Good

4 (28.6%)

Good

4 (28.6%)

Average

4 (28.6%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1